People won't do away with Gmail quickly (even though they could just use the Mail app instead of the Gmail app), but I was even tempted putting Apple Maps on my home screen instead of Google Maps the last couple of days, just to try. I can only assume that Google wants users to keep using their services instead of their competitors.
Use Apple Music. It's better and designed to work seamlessly across all your iOS devices.
Spotify is bloated junkware at this point. They still don't have a way for your manage the cache so it'll keep chewing up your storage until you uninstall the app. Which then means reinstall and manually put all your settings back each time. Haha, they are clueless.